The Oklahoma City National Memorial & Museum has been added to the National Register of Historic Places, on the eve of the 20th anniversary of the April 19, 1995 bombing of the Alfred P. Murrah Federal Building.

President Bill Clinton addresses ceremony of remembrance at the Oklahoma City National Memorial & Museum on Sunday, April 19.

The Oklahoma City National Memorial & Museum and GSA Plaza were formally added to the National Register of Historic Places on April 15. The action by the U.S. Department of the Interior came days before the 20th anniversary of the bombing of the Alfred P. Murrah Federal Building.

The OKC Memorial opened in 2000 on the site of the worst act of domestic terrorism on U.S. soil. Two decades after the attack on April 19, 1995, which claimed 168 lives, the National Memorial & Museum recently underwent an extensive, $10 million renovation that added hundreds of new artifacts.

According to KJRH, museum officials hope to reach younger visitors through new technology, like video and other interactive features.

The Memorial & Museum and GSA Plaza were recently added to the National Register of Historic Places.

Among other exhibits, the museum now includes a room held in remembrance to the victims; a ‘wall of evidence’ that features the driver’s license of Timothy McVeigh, whose truck bomb destroyed the building; and McVeigh’s getaway car.

On Sunday, April 19, the National Memorial & Museum held a ceremony to honor those lost in the attack, the survivors, and their families and friends. Former president Bill Clinton, who visited Oklahoma City after the bombing, delivered the keynote address. Other dignitaries speaking at the event included Gov. Mary Fallin, Mayor Mick Cornett, former Gov. Frank Keating, former Mayor Ron Norick and Susan Winchester, whose sister died in the attack and who serves as chairman of the Memorial & Museum’s board of trustees.